Who was James Cagney? There was a time when fans around the world could have easily answered the question. He was one of the top movie stars, most noted actors and recognizable faces, having starred in many dozens of films including “The Public Enemy,” “White Heat,” and “Yankee Doodle Dandy”. But, as older generations are eclipsed by their successors, the popularity of his films — and this entertainment icon who died in 1986 at the age of 86 — has significantly declined.